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Zinc-aluminum-magnesium intermediate alloy capable of supplementing lost magnesium element in zinc bath and method thereof

A master alloy, zinc-aluminum-magnesium technology, applied in metal material coating process, coating, hot-dip plating process, etc., can solve the problems of reduced magnesium content, high vapor pressure, oxidative burning loss, etc., and achieve faster alloy dissolution. , the fluctuation of magnesium content is reduced, and the effect of improving the efficiency of magnesium supplementation

Pending Publication Date: 2019-05-17
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of hot-dip ZAM alloy coating, due to the high vapor pressure of magnesium element, it is easy to oxidize and burn, causing the magnesium content in the ZAM alloy molten pool to be lower than 3wt.%, and the magnesium content increases with the extension of hot-dip plating time The continuous reduction makes it difficult to guarantee the quality of ZAM galvanized sheet
[0004] At present, in order to stabilize the magnesium content in the molten pool of hot-dip galvanized aluminum-magnesium alloys, Zn-15wt.% Mg master alloy blocks are used to supplement magnesium elements, because the matrix phase of the master alloy is MgZn with a high melting point 2 , it is difficult to dissolve into the zinc-aluminum-magnesium alloy molten pool, resulting in poor effect of magnesium supplementation, so there is an urgent need for an intermediate alloy and its method with higher magnesium supplementation efficiency in actual production

Method used

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  • Zinc-aluminum-magnesium intermediate alloy capable of supplementing lost magnesium element in zinc bath and method thereof
  • Zinc-aluminum-magnesium intermediate alloy capable of supplementing lost magnesium element in zinc bath and method thereof
  • Zinc-aluminum-magnesium intermediate alloy capable of supplementing lost magnesium element in zinc bath and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use industrial pure zinc, pure aluminum and pure magnesium ingots to configure 1000 grams of zinc-aluminum-magnesium alloy according to Zn-6wt.%Al-4%Mg, put the graphite crucible into the well-type resistance furnace and heat it to dark red, and then put the small pieces of zinc Ingots and aluminum ingots are put into crucibles, and the temperature continues to rise to 680°C for melting. After the zinc and aluminum are completely melted, sprinkle a covering agent on the surface of the alloy liquid, the composition of the covering agent is 50% NaCl+25% KCl+25% Na 3 AlF 6 . Clamp the magnesium block with pliers and press it into the bottom of the alloy liquid. After the magnesium block is completely melted, use a glass rod to properly stir the metal liquid. After standing at 580°C for about 10 minutes, remove the inclusions and covering agent on the surface of the metal liquid. The alloy solution is poured into a metal mold with an inner cavity size of 20mm×100mm and a ...

Embodiment 2

[0025] Use industrial pure zinc, pure aluminum and pure magnesium ingots to configure 1000 grams of zinc-aluminum-magnesium alloy according to Zn-6wt.%Al-6%Mg, put the graphite crucible into the well-type resistance furnace and heat it to dark red, and then put the small pieces of zinc Ingots and aluminum ingots are put into crucibles, and the temperature continues to rise to 680°C for melting. After the zinc and aluminum are completely melted, sprinkle a covering agent on the surface of the alloy liquid, the composition of the covering agent is 50% NaCl+25% KCl+25% Na 3 AlF 6 . Clamp the magnesium block with pliers and press it into the bottom of the alloy liquid. After the magnesium block is completely melted, use a glass rod to properly stir the metal liquid. After standing at 580°C for about 10 minutes, remove the inclusions and covering agent on the surface of the metal liquid. The alloy solution is poured into a metal mold with an inner cavity size of 20mm×100mm and a ...

Embodiment 3

[0027] Use industrial pure zinc, pure aluminum and pure magnesium ingots to configure 1000 grams of zinc-aluminum-magnesium alloy according to Zn-6wt.%Al-6%Mg, put the graphite crucible into the well-type resistance furnace and heat it to dark red, and then put the small pieces of zinc Ingots and aluminum ingots are put into crucibles, and the temperature continues to rise to 680°C for melting. After the zinc and aluminum are completely melted, sprinkle a covering agent on the surface of the alloy liquid, the composition of the covering agent is 50% NaCl+25% KCl+25% Na 3 AlF 6 . Clamp the magnesium block with pliers and press it into the bottom of the alloy liquid. After the magnesium block is completely melted, use a glass rod to properly stir the metal liquid. After standing at 580°C for about 10 minutes, remove the inclusions and covering agent on the surface of the metal liquid. The alloy solution is poured into a metal mold with an inner cavity size of 20mm×100mm and a ...

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Abstract

The invention relates to zinc-aluminum-magnesium intermediate alloy capable of supplementing the lost magnesium element in a zinc-6Al-3Mg alloy liquid bath and a method thereof. According to the technical scheme, the zinc-aluminum-magnesium intermediate alloy comprises, by weight, 6wt.% of Al, 4.0-8.0 wt.% of Mg and the balance Zn. The method for supplementing the lost magnesium element in the zinc-6Al-3Mg alloy liquid bath comprises the steps that, granular Zn-6wt.Al-(4.0-8.0)wt.%Mg intermediate alloy accounting for 1.0-2.0wt.% of zinc alloy liquid is added into a zinc-6Al-3Mg alloy molten bath, and the magnesium element in the zinc-6Al-3Mg alloy bath is continuously supplemented. According to the zinc-aluminum-magnesium intermediate alloy and a method thereof, the effect of stabilizing the magnesium content of the zinc-aluminum-magnesium galvanization alloy molten bath is achieved, and the magnesium element supplementing method is simple and reliable.

Description

technical field [0001] The invention relates to a master alloy for hot-dip galvanizing and a method for using the same, in particular to a zinc-aluminum-magnesium master alloy and a replenishing method for supplementing magnesium element loss during continuous galvanizing. Background technique [0002] ZAM (Zn-6wt.%Al-3wt.%Mg) galvanized sheet was successfully developed by Nisshin Steel in the late 1990s. The results of the cyclic corrosion test (CCT) showed that its corrosion resistance was 18 times that of pure zinc coating. times, it exhibits excellent corrosion resistance in both atmospheric and accelerated corrosion environments. The research results show that its excellent corrosion resistance is related to the following factors: the dense corrosion product layer formed on the surface of the coating; Mg improves the corrosion product of the coating (Zn(OH) 8 C 12 ·H 2 O) stability; Mg inhibits the formation of ZnO, a non-protective corrosion product. The surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C18/04C22C1/02C23C2/06
Inventor 王建华刘文德谌可颂苗华磊苏旭平
Owner CHANGZHOU UNIV
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